Tirek returns, and this time, he's plans ahead of the Princesses and even Discord! He first saps their magic and banishes them to Tartarus. Afterwards, he then goes to steal every ounce of magic he can and rule Equestria with a tyrannical fist.

But there's a slight flaw with his plan. What he doesn't know, is that the Children of Harmony are planning to overthrow and destroy Tirek, once and for all. Will the children be able to stop this evil tyrant or will Tirek intimidate them into a corner?

Four months have passed since their battle with the Disney Villains. Twilight is getting ready for the science fair at Canterlot High. So she invited Sunset Shimmer and her friends over on a stormy night to see what she invented a machine that will see different worlds and dimensions full with new discoveries and wonders but when the lightning bolt hit the rode of Twilight's house the Rainbooms got transported into another realm where they discovered a nightclub where all the various Disney characters go to and meet the one and only Mickey Mouse who will help get back to their world before the science fair.

The events take place after the Main 6 defeated Discord, while the other side, Ash has just finished his adventures in Alola. The two worlds intertwine, making the Ash Ketchum and his partner Pikachu cross paths with Twilight Sparkle and her friends.